1) This weekend looks like primarily rain with maybe a change over to some wet snow Saturday night on the back end of the storm. I do not see much of an accumulating snow threat at this point for eastern Pa.
2) Looks to be another storm next Tuesday/Wednesday. Right now way to far out for much of a forecast, but I still think cold air could be an issue, with a rain/snow mix possible.
3) March 1st is the the one I am watching the closest. The GFS continues to tout a major storm in that time period and the EURO had an absolute bomb last night off hatteras in that time period. I think it was down int he 990s to 980s. I like that time frame the most since we are coming out of a negative NAO time period and the PNA is screaming positive at the same time.
4) The GFS develops yet one more big coastal in the fantasy range after that, so yes, we are going to be VERY active for the next 14 days before winter ends.
As discussed yesterday, it's all about cold air at this point. I think a couple storms are very likely, though probably not all of the storms the GFS is currently showing. This weekend could get interesting, as the model is showing high pressure in roughly the right spot. I think your call for mostly rain is the best bet right now, but it won't take much for that to flip.